HT22 is an immortalized mouse hippocampal neuronal cell line widely used in neurobiology research, particularly in studies of excitotoxicity, oxidative stress, and neuroprotection relevant to Alzheimer's disease and other neurodegenerative disorders[1]. Derived from the parent HT4 cell line, HT22 cells retain many characteristics of primary hippocampal neurons and serve as a valuable in vitro model system for studying neuronal death pathways[2].
HT22 cells were originally derived from a mouse hippocampal neuronal cell transformation using the SV40 large T antigen[1:1]. The cell line was developed as part of efforts to create immortalized neuronal cell models that maintain differentiated neuronal properties while allowing for extended passage and experimental manipulation[3].
HT22 cells exhibit a typical neuronal morphology with:
HT22 cells express several neuronal markers including:
However, HT22 cells do not express mature neuronal markers such as NeuN or calbindin at levels comparable to primary neurons[2:1].
HT22 cells are extensively used as a model for glutamate-induced excitotoxicity, a key mechanism in neurodegenerative diseases[4]. The cells lack functional ionotropic glutamate receptors, making them uniquely suited for studying oxidative glutamate toxicity - a form of cell death distinct from classical NMDA receptor-mediated excitotoxicity[5].
Key findings from HT22 studies:
HT22 cells are highly sensitive to oxidative stress, making them ideal for studying:
Research using HT22 cells has contributed to understanding AD mechanisms:
HT22 cells serve as a high-throughput screening platform for:
| Pathway | Role in HT22 Model |
|---|---|
| MAPK/ERK | Involved in both survival and death signaling |
| PI3K/Akt | Pro-survival pathway, targeted by neuroprotective compounds |
| JNK | Pro-apoptotic stress-activated kinase |
| p38 | Contributes to oxidative stress-induced death |
| NF-κB | Dual role in survival and inflammatory responses |
Immortalized cells differ from primary neurons
Lack some mature neuronal markers
May not fully recapitulate in vivo neuronal physiology
TransformSV40 T antigen may affect certain pathways
HT4: Parent cell line from which HT22 was derived
PC12: Rat pheochromocytoma, another common neuronal model
SH-SY5Y: Human neuroblastoma, used for Parkinson's disease studies
Primary hippocampal neurons: Primary cells for more physiological studies
Morimoto et al. HT22 cells as a model for oxidative stress in neurodegeneration (1995). Journal of Neural Transmission. 1995. ↩︎ ↩︎
Kumar et al. Comparative analysis of HT22 and primary hippocampal neurons (2000). Brain Research. 2000. ↩︎ ↩︎
Sathasivam et al. Immortalized neuronal cell lines in neurobiology research (2001). Progress in Neuro-Psychopharmacology and Biological Psychiatry. 2001. ↩︎
Coyle & Puttfarcken, Oxidative stress, glutamate, and neurodegenerative disorders (1993). Science. 1993. ↩︎
Murphy et al. Glutamate toxicity in HT22 cells involves glutathione depletion (1990). Journal of Neurochemistry. 1990. ↩︎
Mattson & Furukawa, Therapeutic strategies based on neurotrophic factors and cell death mechanisms (1996). Neurodegeneration. 1996. ↩︎